What in the world happened to Kraken? 

https://www.livemint.com/science/health/new-covid-variant-kraken-termed-most-transmissible-by-who-should-you-be-worried-11672915053621.html 

The Kraken Covid variant, nickname of XBB.1.5, is a descendant of the Omicron XBB sub-variant. First detected in the United States in 2022, this variant has quickly picked up pace and has now been detected in 28 other countries, according to World Health Organization (WHO).